JP4560539B2 - Manufacturing method of containers for storing products - Google Patents

Abstract

A flexible container and method for making same are provided. The container comprises a base portion including a bottom, side walls, and an interior, the bottom defining a substantially flat planar surface when the container houses product and the container rests on its bottom, an upper panel portion, that is designed to be received within the interior of the base portion and includes side panels that define a closure member, the upper panel being so constructed and arranged to define a substantially flat surface when the closure member is closed and portions of the upper panel are folded over, the upper panel includes a portion that is sealed to the base portion, and a pair of handles may also be coupled to the base portion.

Description

Detailed Description of the Invention

(Technical field)
The present invention generally relates to a method of manufacturing a container for storing products. More particularly, the present invention relates to a method for manufacturing a flexible container for storing products.

(Background of the Invention)
There are various types of containers for storing products. For example, it is known to package products in rigid containers such as metal cans, glass bottles, or rigid plastic containers. A rigid container provides a large volume of empty space when empty. As a result, rigid empty containers are cumbersome to transport to destinations where products are filled and sealed. In addition, such empty containers require significant space for storage and disposal.

  It is also known to make containers from flexible materials such as sheets or rolls of plastic material. Such flexible containers have existed for many years. Those containers offer many advantages over rigid containers. For example, flexible plastic bottles and cartons provide distinct advantages over metal cans and glass bottles. In that regard, such flexible containers are lighter, generally less costly to manufacture, and much easier to dispose of.

  However, flexible containers have inherent disadvantages. For example, flexible containers do not have the strength of typical rigid containers. The robustness of the container can be a problem with the stability of the container when the container is filled with product and upright for storage, display, or other purposes. Furthermore, heavy flexible containers are difficult to pick up and carry conveniently.

  In order to overcome this stability problem, the flexible container is formed by reinforcing the bottom or sides. Such a container is shown in US Pat. No. 5,135,464. To create such a reinforced embodiment, the plastic film or paper layer is doubled at a selected location along or adjacent to the bottom of the container during container manufacture. The bilayer is fused by a heat sealing (sealing) or stitching process. However, such a structure results in multiple layers of film or paper overlapping the seam. In that regard, as many as six layers meet and often fuse together as a seam or seam. Due to this multi-wall structure, the sealing portion tends to leak due to capillary action.

  Another problem with many flexible containers is that the production process is inconsistent. In general, the manufacturing process associated with such products requires the web of film to be passed through a series of forming stations, where various bends, notches, or seals are applied to the film. Apply. In many of these manufacturing processes, it is difficult to ensure the accuracy and consistency of the resulting product given the number of operations on the film and the number of bends, seals and molding stations. In addition, there are sealing issues with currently available heavy packaging bags. As such, the bag is not “impervious” and causes problems when the container is stored with the product. Also, since the container is not resealable, it cannot be stored between uses.

  Yet another problem with flexible containers is their tendency to rupture. This is a problem especially when the container falls.

  Furthermore, the shape of such containers is a problem. Due to the flexible nature of the container, the container will be in the shape of the product stored therein and / or in the form of a bag. This makes it difficult to store, stack, and / or pack containers for transportation. In general, multi-layer bags must be stored and displayed in a flat state in the horizontal direction, making handling of the bags difficult. In addition, when the bags are stacked horizontally, it is difficult to see the label on the bag.

  The lack of stability also causes problems when the user attempts to skim or dispense the product from the bag.

  Another problem with current flexible bags is that it is not easy to move after filling the bags at the distribution center or manufacturing plant or after the filled bags arrive at the point of purchase. Generally, packaged products are moved through a manufacturing plant or purchase point conveyor system. Often conveyor systems include sharp bends (such as 90 degree bends) and gaps. A large multi-layer bag is not stable and difficult to handle in size, so it cannot go around the bend and cannot pass through the gap. As a result, large multilayer bags cannot be moved by conveyor systems like other packaged products and must be handled manually.

  Accordingly, there is a need for an improved flexible container that is convenient for opening and closing the container, and a method for manufacturing such a container, for storing and transporting products.

  SUMMARY OF THE INVENTION The present invention provides an improved container and method for making the same. The improved container is a flexible container that is sufficiently stable to be used for product storage. At the same time, the container of the present invention provides the desired flexibility.

  Therefore, in one form of this invention, a flexible container provided with the base part containing a bottom part, a side wall, and an inside is provided. The bottom defines a substantially flat surface when the container stores the product and rests on the bottom during use. An upper plate portion adapted to be received within the interior of the base is provided. The upper plate portion includes a side plate that defines a sealing member. The top plate is created and configured to define a substantially flat surface when the sealing member is closed and the top plate portion is folded. The upper plate includes a portion sealed to the base.

  In one embodiment, the container includes a pair of handles joined to the base. Each of the pair of handles can be joined to a separate side wall of the base.

  In a preferred embodiment, a pair of handles and an upper plate are each thermally sealed inside the base.

  In one embodiment, the closed container has a substantially cubic shape.

  In an alternative embodiment, the closed container is triangular.

  In one embodiment, the sealing member is resealable.

  The sealing member can be a ziplock, hook and loop seal, zipper or the like.

  In one embodiment, the sealing member may include an adhesive seal or an adhesive seal.

  In certain preferred embodiments, the top plate portion extends partially below the upper end of the base.

  In one embodiment, a portion of the handle extends above the top plate after closing the container.

  In one embodiment, the base includes two triangular sections, each extending from a separate side of the base bottom to the bottom of the container side. The triangular portion can be adapted during use to form a cavity between the inner and outer triangular sections, such a cavity being a handle for the user. The cavity can extend from the side of the base bottom to the bottom of the container side.

  In one embodiment, the base bottom includes a pair of handles.

  In another embodiment of the present invention, a flexible container is provided. The flexible container comprises a base including a bottom, a sidewall, and an interior, the sidewall being defined by at least two sheets of flexible material sealed along two edges and located on opposite sides of the base. Two seams are defined. An upper plate portion is provided that is received within the base and includes a side plate that defines a resealable sealing member. The top plate defines a substantially flat surface when the sealing member is closed. A part of the upper plate is sealed at the bottom. The container preferably includes a pair of handles.

  In one embodiment, the pair of handles is an upper handle and the base includes a pair of lower handles. Each lower handle extends from a respective tip of the base bottom to the lower part of each side of the container.

  In one embodiment, the base includes two triangular portions. Each triangular portion extends from the other side of the bottom to the respective side seam.

  In one embodiment, a pair of handles and an upper plate are each thermally sealed inside the base.

  In one embodiment, the sealing member includes a hook and loop seal.

  In one embodiment, the upper plate portion extends partially below the upper end of the base.

  In another embodiment of the present invention, a method of making a flexible container having a base provides a flat plastic material sheet having a width substantially equal to the length of the base, and the flat sheet is at least a base. Including intermittent feeding at intervals equal to the width of. Further, the method joins the pair of handles to the flat sheet. Furthermore, a pair of plates is supplied, and each of the pair of plates is joined to one of the flat sheet and the pair of handles. Sealing means is attached to the free ends of each of the pair of plates. The flat sheet, the pair of plates and the pair of handles are then formed into a flexible container.

  In one embodiment, the method of making the container includes depositing a peel seal near each end of the flat sheet, each peel seal extending to the width of the base.

  In one embodiment, a hermetic seal is provided by the container fabrication method.

  In one embodiment, the container fabrication method supplies a flat plastic material sheet from a web roll.

  In one embodiment, the container fabrication method provides a substantially cubic container.

  Accordingly, it is an advantage of the present invention to provide an improved flexible container.

  Furthermore, it is an advantage of the present invention to provide an improved method for manufacturing containers.

  It is also an advantage of the present invention to provide an improved container for storing various products.

  It is still an advantage of the present invention to provide an improved flexible container that includes an easily resealable seal.

  Furthermore, it is an advantage of the present invention to provide a flexible container that can be stacked after the product is filled.

  Furthermore, it is an advantage of the present invention to provide a container that can be easily carried by a consumer.

  It is another advantage of the present invention to provide a container with improved strength characteristics.

  Further features and advantages of the present invention will become apparent from the following description and detailed description of the presently preferred embodiments and from the drawings.

(Detailed description of the presently preferred embodiment)
The present invention provides an improved container for product storage and a method for making the same. The container is made from a flexible material, such as a plastic film, and has sufficient rigidity and strength to store and store various products. Furthermore, this container can be stacked by the structure. It can also be made from a laminated sheet material.

  FIG. 1 is a perspective view of an embodiment of a container 10 of the present invention. The figure shows the container 10 filled with product 11 and open. As shown in FIG. 4, the sealed container 10 has a cubic shape in a preferred embodiment. The cube-shaped soft container 10 is a container having greater stability during storage. Further, the cubic container 10 allows the stacking of several filled containers as shown in FIG. This not only allows the display of containers / products at the store, but also makes it easier for consumers to store and a more compact product for transportation and storage.

  In a preferred embodiment, the container has a pair of handles. They are preferably upper handles. However, the base can also include a pair of lower handles. Each lower handle extends from each corner of the base bottom to the bottom of each side of the container.

  In particular, FIGS. 1 and 2 show an embodiment of a container 10. In general, the container 10 includes three main components: a base 12, a top plate 14, and handles 16 and 18. As will be described below, these three components are sealed together to create the container 10. However, the handle is not essential for forming the container. Thus, other embodiments of the present invention do not include a handle.

  The base 12 includes a bottom 20. The bottom 20 is structured to define a substantially flat surface. The bottom 20 is thus a surface that can support the product 11 stored in the container 10. Further, the container 10 can be supported on a flat surface by the bottom portion 20, and the stability of the filled container can be obtained. In a preferred embodiment, the bottom 20 is made from a rectangular sheet material that is thermally sealed to other portions of the base 12.

  The base 12 includes four sides 22, 24, 26 and 28 in the preferred embodiment shown. The four sides 22, 24, 26 and 28 define an interior 30 along the bottom 20 that stores the product 11. In the preferred embodiment shown, the sides 22, 24, 26 and 28 of the base 12 define two sheet materials that are sealingly joined along the side seams 29 and 31. As shown, side seams 29 and 31 are positioned on sides 22 and 26 of base 12.

  Triangular base sections or end walls 34 and 36 are formed in the lower portions 23 and 25 of each side 22 and 26. Indeed, each triangular base section 34 and 36 is defined by two sealed transient side seams 33, 35 and 39, 41, respectively. Transient side seams 33, 35 and 39, 41 extend from tips 20 a, 20 b and 20 c, 20 d of bottom 20 to vertices 29 a, 31 a located along side seams 29 and 31. Each triangular base section has third sides 42, 43 extending between the tips 20a, 20b and 20c, 20d, respectively. The lower side seam 44 extends integrally from the vertices 29 a and 31 a along the side seams 29 and 31 to the third side portions 42 and 43. This structure reinforces the lower portions 23, 25 of the container sides 22 and 26 along the seams 29 and 31. The resulting seam does not have a concentrated intersection of six sealing layers that are prone to capillary leaks as in conventional containers. Furthermore, this structure enables good web control, resulting in a highly efficient container manufacturing method.

  As shown in FIG. 7, the base 12 also includes inner triangular base sections 34a and 36a adjacent to the outer triangular sections 34 and 36. The inner and outer triangular sections 34a, 34 and 36a, 36 are compressed when filling the container. This triangular section has the advantage of being slightly conical or pyramid shaped, and can form a “handed” cavity between the inner and outer triangular sections. In that regard, the “hand” cavity acts as a separate handle so that the consumer can pick up the container and easily dispense or dispense the product from the container.

  Note that the base 12 can be of various sizes and shapes. For example, a container 10 containing about 8 kg (18 pounds) of dry product such as cat food, in a preferred embodiment, has a base height “a” of about 30 cm and sides 22 and 26 having a width “b” of about 30 cm. The width “c” of the side portions 24 and 28 is about 30 cm. A container containing about 9 kg of dry product such as dog food, in a preferred embodiment, has a base height “a” of about 31 cm, side portions 22 and 26 having a width “b” of about 23 cm, and side portions 20 and 24. The length “c” is about 30 cm.

  The base 12 and other parts of the container 10 are preferably made of a thin plastic material. For example, the container base 12 can be fabricated from a double structure consisting of a heat sealable polyethylene layer and a stampable polyester layer. However, both layers can be polyethylene. By way of example, the materials used to construct the container 10 and base 12 include a polyethylene ply of about 0.0635 mm (2.5 mil) and a polyester layer of about 0.0127 mm (0.5 mil). can do. However, it is not limited to this.

  The container 10 preferably includes two handles 16 and 18. Handles 16 and 18 provide gripping members for carrying the container, either before or after filling the container. Of course, the handles 16 and 18 can be of various shapes and sizes. In addition, the handles 16 and 18 can be made from a variety of materials suitable for variable load strength. In the preferred embodiment, the handles 16 and 18 are 43 cm long and double thick before being secured to the container. In that regard, the handle is made from a web of film and the strength of the handle is increased by folding the film. To that extent, the handles 16 and 18 can be made from a single piece of plastic film.

  As shown in FIGS. 1 and 2, the container 10 includes a top plate portion 14. The top plate portion includes four sides 46, 48, 50 and 52. The top plate 14 is made from two materials sealed along two seams 54 and 56, similar to the side walls 22, 24, 26 and 28 of the base 12. In a preferred embodiment, the top plate seams 54 and 56 are aligned with the side seams 29 and 31 of the base 12 when the top plate 14 is secured to the base 12. In the container 10 shown in FIG. 1, the top plate defines an opening 61 that provides access to the interior of the container 10.

  One side 52 of the top plate 14 is preferably slightly longer than the other sides 46, 48 and 50. In the illustrated embodiment, the side 52 includes a sealing member 60 that helps seal the container 10. The sealing member 60 is fixed to the corresponding sealing member 62 on the side portion 48.

  For example, in the illustrated embodiment, side 52 includes a hook and loop strip 60 that engages a corresponding hook and loop strip 62 on side 48. Thereby, the container 10 can be easily opened and closed. Therefore, the container 11 can be first filled with the product 11 through the opening 61 and closed by the sealing members 60 and 62. The consumer can then utilize the product through the opening 61 and use the sealing members 60 and 62 to close the container 10 again. However, it should be noted that various sealing means and members can be used. For example, the seal may include a zipper, ziplock or sliding structure, or an adhesive member.

  As previously noted, the top plate 14 and handles 16 and 18 are preferably made from a different material than the base 12.

  Similar to the base, the top plate 14 can be of various sizes and shapes. For example, with reference to FIG. 2, in a preferred embodiment of the container 10, the container 10 storing 8 kg of dry product has a length “d” of the sides 48, 50 and 54 of the top plate 14 of about 19 cm and the side 52. The length “e” is about 22 cm. The width of the side portion of the upper plate 14 corresponds to the width of the corresponding side portion of the base portion 12. The container 10 for storing 9 kg of dry product has a length “d”, in a preferred embodiment of about 24 cm and a length “e” of about 27 cm.

  The upper plate 14 is made so as to be received in the base 12. In a preferred embodiment, at least about 2.5 cm of the top plate 14 is received in the base 12. The top plate 14 is then preferably heat sealed to the base 12. It has been found that a bond between the top plate 14 and the base 12 is sufficiently strong with a heat seal of at least 2.5 cm.

  In making the container 10, the handles 16 and 18 are preferably received between the top plate 14 and the base 12. The base 12 is sealed to the upper plate 14 and the handles 16 and 18 are sealed between them to thermally seal them. Specifically, the pair of handles 16 and 18 and the top plate 14 are thermally sealed to each other and the interior of the base 12. Inside the top plate is another polyethylene sealant layer that facilitates opening the container while sealing the interior of the container. Thereby, a structure having sufficient strength and a structure in which the weight of the contents is evenly distributed to the base 12 is obtained. Furthermore, the sealing members 60 and 62 located on the upper plate 14 can be closed by such a structure.

  As a result, the base 12, top plate 14 and handles 16 and 18 are thermally joined to form a sealed interior.

  Furthermore, the top plate 14 can be manufactured from a non-slip plastic material. Non-slip plastic material allows vertical stacking with limited sliding between the upper and lower containers.

  3, 4, 5A and 5B show how the container 10 is closed. As shown in FIG. 3, the sealing members 60 and 62 are first fixed to each other. At the time of fixing, the side portions 46 and 50 are folded inward to generate a triangular portion 70. Sides 48 and 52 are then folded over to side 48 as shown in FIGS. 4 and 5A. By folding the sides in this manner, a flat upper surface 72 is generated. In general, the length of surplus material from the bends on the sides 48 and 52 to the sealing member will vary depending on the density of the product. If the density of the product is very high, the product takes up less space in the container and vice versa. After folding the container side, tap along the outer bends of the sides 48 and 52 to further seal the container 10.

  Instead, FIG. 5B shows another method of folding and closing the container to produce the desired flat top surface 72. Specifically, the method shown in FIG. 5B incorporates a double fold and diffracts sides 48 and 52 twice. By double folding, the strength of the upper surface of the container is remarkably increased, and the sealing members 60 and 62 are separated.

  When closed in this manner, the container 10 has a substantially cubic shape as shown in FIG. The flat bottom 20 and the flat top surface 72 allow the multiple containers 10, 10a, 10b, 10c, 10d and 10e to be stacked in the vertical direction as shown in FIG. 6, or to be stored or transported.

  The container 10 of the present invention has burst resistance properties derived from its structure, and is improved over that in the prior art. In prior art containers, the sides expand due to the impact of falling containers. This expansion or expansion is transmitted directly into the seam and the seam is pulled in the opposite direction. As a result, the container is often torn.

  In the present invention, the side seams 29 and 31 of the container 10 lead to the lower side seam 44 formed from the transition side seams 33, 35 and 39, 41. Therefore, when the container is expanded by dropping or the like, most of the force arranged in the facing direction is placed on the lower side seam. Thus, even if one or both of the lower side seams are pulled by these forces, the action does not break the product storage portion of the container, whether the product is a solid pellet or a liquid.

  Other embodiments of the present invention include containers of various shapes and sizes. For example, the container can be substantially triangular. In that case, the container includes a flat bottom and two sealed sides. However, although the top is bent, it is not flat like the upper surface of the three-dimensional container.

  In one embodiment, the method of manufacturing the container involves a web-roll process for obtaining a flat blank and a molding process for forming the base 12 and sealingly joining the base. As a result, a substantially plate-like container is obtained. After the web roll process and the molding process, the plate-like container can be assembled at any time, filled with product and sealed. The plate-like container has the advantage that it can be transported to a factory or distribution center where it can be assembled, filled with products and sealed. Of course, container assembly, filling and sealing can be done in the same place as the web roll and molding process.

  Referring to FIG. 8, in the web roll process, the base 12 is supplied by a master web roll of plastic material. As described above, the plastic material is a double structure composed of, for example, a heat-sealable polyethylene layer and a sealable polyester layer.

  When the web roll is unfolded, a flat plastic sheet approximately the width L of the base 12 is supplied. This flat sheet is intermittently fed in a progressive mode along the process and can be several tens of meters long.

  Generally, in the progressive mode of the process, a flat sheet is intermittently fed at intervals corresponding to at least the width W of the base 12. In this example, during the process, the polyethylene side of the flat sheet (eventually the inside of the container) faces up or front side 100 and the polyester side (eventually the container outside) faces down or back 102.

  When a flat sheet is intermittently fed by the container width W, ready-made handles 16 and 18 are introduced and thermally bonded to the front (polyethylene) side 100 of the base 12.

  Handles 16 and 18 are also manufactured from a plastic sheet approximately 5 cm wide. (See, for example, handle 18 in FIG. 3). Similar to the flat sheet of the base 12, the flat sheet of the handle can also be obtained from a web roll. When the flat sheet is unrolled from the web roll, each end in the width direction of the flat sheet is partially bent at the center so that the seam 18a is in the middle. The seam is then thermally bonded to form a ribbon-like strip. This ribbon is cut to the desired length of the handle. At this time, the handles 16 and 18 are each formed in a U-shape as shown in FIG.

  After the handles 16 and 18 are joined to the base 12, the flat sheet is intermittently fed again, and the left plate 104 and the right plate 106 are introduced. Plates 104 and 106 ultimately form the upper plate portion 14 of the container. Each plate 104, 106 is positioned in alignment with the width W of the base 12. Each plate 104, 106 is superimposed on the side 110, 112 of the flat sheet. The plates 104, 106 are then thermally bonded to the flat sheet and the handle side 107 opposite the handle side 109 previously bonded to the base 12. In that regard, a hermetic seal is formed by a joining process. In addition, another sealant can be applied to each end 115, 117 of the handles 16 and 18. In this embodiment, the sealant surrounds the handle ends 115, 117 prior to the introduction of the plates 104, 106.

  Next, the flat sheet is intermittently fed forward again. At this point, sealing members 60, 62 (not shown in FIG. 8) can be added and thermally bonded to the free ends 114, 116 of the left and right plates 104, 106, respectively.

  The sections 120 of the free ends 114, 116 are cut away to form a flap 122. One of the two flaps 122 is folded over the other, and the container is closed. Thus, the notch 120 can vary depending on the type of sealing member used in the container.

  Further, a thin sealant 128 can be applied to the left and right plates 104, 106 as a peel seal. Specifically, this thin sealant extends along the width W of the plates 104, 106. The peel seal is a temporary seal that is opened by the user when the product user opens the container.

  At this point, the flat blank is subsequently sent to the molding process. Alternatively, the flat blank portion can be formed later or elsewhere. In that regard, the flat blank is wound or reciprocated on a large spindle type web roll and placed in a storage and shipping container.

  In general, the molding process includes flat blank base molding, base seal bonding, and, if desired, bending of the base bottom, thereby transporting or storing the container again substantially in the form of a plate. As an example, US patent application Ser. No. 09 / 467,125, filed Dec. 20, 1999, is hereby incorporated by reference. This application discloses a manufacturing technique that can be used for base molding of the container of the present invention.

  In particular, the flat blank is intermittently fed forward. As it moves forward, the flat blank is hung on a v-shaped molded plow and bent in half at the centerline 130 of the base 12 through two rollers to form a web fold. . The bent portion has first and second layers. The first and second layers each have a bottom located adjacent to the web fold.

  Notches are formed at the bottom of each layer at intervals extending from each side of the web fold. The tops of the first and second layers are heat seal bonded to finally form the side seams 29 and 31 of the completed container 10. The end of the side heat seal is spaced from and aligned with the notch. The bottoms of the first and second layers are folded to create two bottom bends. The bottom has a section aligned with the top side seal. The bottom alignment section is heat seal bonded to form a side seal extension. A region of the bottom is heat seal bonded adjacent to the side seal extension. The molded flat blank is then cut along the side seal and side seal extension to form individual containers.

  As described above, the container 10 of the present invention can be manufactured initially as a flat structure, so its flexibility is an advantage. Therefore, countless containers can be compressed into a uniform, compact state and transported to the second manufacturing plant or distribution center by pallets or the like to be assembled and filled with products. In the process, the internal cavity 61 of the container 10 is assembled, filled with products, sealed, and transported or stored at the store.

  Of course, various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such variations and modifications do not depart from the spirit and scope of the present invention and do not diminish the intended advantages of the present invention. Accordingly, such modifications and changes are encompassed in the claims.

It is a see-through | perspective perspective view which shows embodiment of the container by this invention of the state with which the product was filled before sealing. It is a see-through | perspective perspective view which shows the separate component of the container before joining. It is a perspective view of the container just before sealing. It is a perspective view of the container of the sealed state for storage. It is the VV sectional view taken on the line of the container of FIG. FIG. 5 is a cross-sectional view taken along line VV of an alternative embodiment of the container of FIG. 4. FIG. 6 shows a plurality of stacked sealed / closed containers. FIG. 5 is a bottom perspective view of a base section incorporating a “handle” cavity. It is a perspective view of the flat blank of the container in a manufacturing process.

Claims (5)

A method of making a flexible container (30) having a base (12), comprising:
Providing a flat sheet of plastic material having a width substantially equal to the length of the base;
Intermittently feeding a flat sheet at an interval equal to at least the width of the base;
Joining a pair of handles to a flat sheet;
Supplying a pair of plates;
Joining each of the pair of plates to one of a flat sheet and a pair of handles;
Applying sealing means to each free end of a pair of plates;
Forming a flat sheet, a pair of plates and a pair of handles into a flexible container.   The method of claim 1 further comprising the step of depositing peel seals near each end of the flat sheet, each peel seal extending the width of the base.   The method of manufacturing a flexible container according to claim 1 or 2, wherein the step of joining each of the pair of plates to one of the flat sheet and the pair of handles realizes a hermetic seal through a thermal joining process. .   The method for producing a flexible container according to any one of claims 1 to 3, wherein the step of supplying a flat sheet of plastic material is performed via a web roll.   The method of manufacturing a flexible container according to any one of claims 1 to 4, wherein the step of forming the flexible container provides a substantially cubic container.

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